Lubricating oil



Patented Aug. 9, 1938 PATENT OFFICE LUBRIOATING OIL Leo Liberthson, New York, N. Y., assignor to L. Sonneborn Sons Inc., a corporation oi Delaware No Drawing. Application March 3, 1936.

Serial NO. 66321 4 Claims. (Cl. 87-9) This invention relates to lubricating oils.

An object of the invention is the provision of a lubricating oil which will not appreciably corrode metal surfaces.

A lubricating oil derived from a Pennsylvania paraflin base crude and containing varying amounts of paramnic constituents will corrode metal or alloy surfaces with which it comes in contact under temperature and pressure conditions obtaining in practice, and in many cases to such an extent, that the metal will, after a period of time, be deteriorated to a point where it must be replaced. The relatively short'life of the metal renders its use expensive, and its replacement in many cases inconvenient.

I have discovered that the addition of from 0.05 to 0.5% of cadmium mahogany sulphonate will give to such Pennsylvania paraflin base lubricating oil anti-corrosive properties, and that metal or alloy surfaces coming in contact with such blended oil will not be corroded to the extent that has heretofore been experienced.

The cadmium mahogany sulphonate may be obtained by treating a lubricating oil fraction, for example, a fraction derived from a naphthenic base crude with sulphuric acid, preferably oleum. Such treatmentyields an acid sludge, which contains water soluble "green" sulphonic acids, and an oil layer which contains 011 soluble, mahogany" sulphonic acids. The oil layer is separated from the acid sludge and treated with alkali, such as sodium or potassium hydroxide, whereupon sodium or potassium mahogany sulphonate is formed. The mahogany sulphonate can be extracted from such oil by treatment with an organic solvent, such as an aqueous alcoholic solution. Upon distillation of the alcoholic solution, the alkali metal mahogany sulphonate is recovered. The alkali metal mahogany sulphonate is dispersed in water at an elevated temperature, for example, at about 100 0., a soluble cadmium salt is added. and the cadmium mahogany. sulphonate is precipitated.

The lubricating oil to which the said sulphonate is added, is ode derived from a Pennsylvania paraiiin base crude, for example, a straight distillate containing varying amounts of paraflinic constituents or may consist predominantly of the same. It is common practice to blend straight dlstillates with small amounts of bottoms. for example, an S. A. E. 20 commercial grade of 90% straight distillate and 10% bottoms.

The addition of from 0.05 to 0.5% of cadmium mahogany sulphonate to a lubricating oil derived from a Pennsylvania paraiiin base crude and containing varying amounts of paraflinic constituents yields an oil which will not cause the corrosion normally associated with an oil not so treated, and metal or alloy surfaces which come in contact with my novel lubricant will experience a. much longer life.

The above description is for purpose of illustration and not of limitation. and is not to be limited except by the appended claims in which I have endeavored to claim all inherent novelty.

I claim: l. A non-corroding lubricating oil composition consisting of a lubricating oil containing paramnic constituents, and from 0.05 to 0.5% of a cadmium mahogany sulphonate, said lubricating oil being derived from a Pennsylvania paraiiin base crude.

2. A non-corroding lubricating oil composition consisting of a lubricating oil distillate containing paraiilnlc constituents, and from 0.05 to 0.5% of a cadmium mahogany sulphonate, said lubricating oil distillate being derived from a Pennsylvania parafiin base crude.

3. A non-corroding lubricating oil composition consisting predominantly of a lubricating oil distillate containing paraflinic constituents, and from 0.05to 0.5% of a cadmium mahogany suiphonate, said lubricating oil distillate being derived from a Pennsylvania paraflin base crude.

4. A non-corroding lubricating oil composition consisting of a lubricating oil derived from a Pennsylvania paraflin base crude, parailinic matter, and from 0.05 to 0.5% of a cadmium mahogany sulphonate.

LE0 LIBERTHSON. 

